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初夏太湖梅梁湾营养盐的大气沉降

发表时间:2012-12-31  浏览量:1533  下载量:619
全部作者: 尹昊,郭琳,陈莹,王琼真
作者单位: 复旦大学环境科学与工程系
摘 要: 采用大气颗粒物沉降模型与分级采样器采样结合的方式,较为准确地测算太湖营养盐的大气干沉降通量及时间变化特征。结果表明:大气细颗粒物中氮盐浓度高达3.6 μg·N·m-3,是粗颗粒中含量的2倍以上,但粗颗粒对无机氮的干沉降通量起主要贡献。初夏时期无机氮的日均干沉降通量达(1 087±250)μg·N·m-2·d-1,其中,N-NH+4的比例占到59%,日均湿沉降的通量约为8 591 μg·N·m-2·d-1,以此推算年平均大气氮沉降量可占到外源输入的29%~42%. 大气沉降将促使湖水中N/P比值增加,有利于浮游藻类生长,成为可能诱发蓝藻水华的一个重要因子。
关 键 词: 大气科学;大气干沉降;富营养化;营养盐;太湖
Title: Atmospheric dry deposition of nutrients over Meiliang Bay of Tai Lake in early summer
Author: YIN Hao, GUO Lin, CHEN Ying, WANG Qiongzhen
Organization: Department of Environmental Science and Engineering, Fudan University
Abstract: This paper used a particle deposition model combined with cascade samples to estimate dry deposition flux of nutrients and their temporal variation over Tai Lake. The results showed that High concentration of dissolved inorganic nitrogen (DIN) was observed in fine particles with an average of 3.6 μg·N·m-3, which was about twice as much as that in coarse particles. However, the coarse particles were the main contributor to the dry deposition flux of DIN. In early summer, the daily average dry flux of DIN reached (1 087±250) μg·N·m-2 d-1, in which 59% was contributed by N-NH+4. The daily wet deposition flux was approximately 8 591 μg·N·m-2·d-1, and thereby atmospheric deposition of DIN accounted for 29%-42% of the external inputs. Atmospheric deposition could elevate the N/P ratio in surface water, which was benifical to the growth of planktonic algae and might be one of factors triggering cyanobacterial bloom.
Key words: atmospheric science; atmospheric dry deposition; eutrophication; nutrients; Tai Lake
发表期数: 2012年12月第24期
引用格式: 尹昊,郭琳,陈莹,等. 初夏太湖梅梁湾营养盐的大气沉降[J]. 中国科技论文在线精品论文,2012,5(24):2368-2375.
 
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